I can try to answer any questions, but it doesn't seem like the 8bitdo Ultimate software is availible for download yet. Im not big into mechanical keyboards, this is actually my first, so I don't have much direct comparison experience to other keyboards.
but the buttons are big and f u n.
If they were going to put an A and B button on the keyboard then they should've put A on Ctrl and B on Alt. That way it would have the correct layout for Commander Keen, Duke Nukum and a million other DOS platformers.